Control of Carbon Macro-Segregation in <>600 mm Casting Round Bloom of Low Carbon Steel Q345E

颜慧成; 王大鹏; 李; 尹修刚; 刘爱强; 张兴中

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Control of Carbon Macro-Segregation in <>600 mm Casting Round Bloom of Low Carbon Steel Q345E

更新时间：2026-01-21

- Control of Carbon Macro-Segregation in <>600 mm Casting Round Bloom of Low Carbon Steel Q345E
- Special Steel Vol. 36, Issue 1, Pages: 31-33(2015)
- 作者机构：
  
  1. 钢铁研究总院连铸技术国家工程研究中心,北京,100081
  2. 承德建龙特殊钢有限公司，兴隆,067201
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：28 July 2014，
  
  Online First：29 August 2022，
  
  Published：29 August 2015
- 稿件说明：
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颜慧成, 王大鹏, 李, et al. Control of Carbon Macro-Segregation in <>600 mm Casting Round Bloom of Low Carbon Steel Q345E[J]. Special Steel, 2015, 36(1): 31-33.
DOI：

颜慧成, 王大鹏, 李, et al. Control of Carbon Macro-Segregation in <>600 mm Casting Round Bloom of Low Carbon Steel Q345E[J]. Special Steel, 2015, 36(1): 31-33. DOI：

摘要

Q345E钢(/%:0.13~0.17C

0.24~0.28Si

1.02~1.40Mn

0.015~0.040Al

≤0.015P

≤0.015S)的冶金流程为70 t转炉-LF-VD-Φ600 mm圆坯连铸工艺。通过0.08 L/kg比水量和0.18、0.20、0.22 m/min拉速条件下的凝固模拟计算

结合拉速0.22 m/min

过热度20℃

一冷4 600 L/min(进出水温差2.7℃)

二冷L

-38、L

-6和L

-5 L/min条件下的射钉试验

确定该拉速下Q345E钢Φ600 m/圆坯的凝固末端位置距弯月面22.4 m

在此基础上优化结晶器M-EMS\末端F-EMS组合电磁搅拌

调整连铸工艺

使大圆坯宏观碳偏析取得显著改善。结果表明

浇铸过热度、电磁搅拌参数是影响碳偏析的重要工艺条件;当过热度20~30℃、拉速0.22~0.24 m/min、 M-EMS(200 A

2 Hz)、F-EMS(400 A

8 Hz)交替搅拌时

Q345E钢Φ600 mm断面碳极差≤0.04%C。

Abstract

The metallurgical flow sheet of steel Q345E (/% ： 0. 13 ~0. 17C

0.24 - 0.28Si

1. 02 ~ 1. 40Mn

0. 015 ~ 0

040Al

≤0. 015P

≤0. 015S) is 70 t converter-LF-VD- Φ600 mm round bloom casting process. By simulated calculation on solidification in condition with secondary cooling water ratio 0. 08 L/kg and casting speed 0. 18

20 and 0. 22 m/min and combined with pin-shooting test in conditions of casting speed 0. 22 m/min

liquid overheating extent 20 °C

mold cooling rate 4 600 l/min (water temperature difference between inlet and outlet 2. 7℃)

secondary cooling water rate L

-38

-6 and L

-5 L/min

the position of end of liquid core- dis

tance from meniscus 22. 4 m for Φ600 mm round bloom of steel Q345E with the casting speed is defined and based on this test the carbon macro-segregation of heavy round bloom improves obviously by application of optimized M-EMS \ (final) F-EMS combined electro-magnetic stirring (EMS) technology and adjustment of casting process. Results show that casting liquid overheating extent and EMS parameters are important factors to influence the carbon segregation of bloom ； with overheating extent 20 ~ 30℃ ，casting speed 0. 22 ~0. 24 m/min

M-EMS 200 A

2 Hz and F-EMS 400 A

8 Hz alternative stirring

the extreme difference of carbon content in steel Q345E at cross section of Φ600 mm round bloom is below 0. 04% C.

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